### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

copyObject and putObject (and perhaps other requests) requests are accepted and do not return an error when an SSE KMS key is specified. 

### Expected Behavior

The error which should be returned is KMS.NotFoundException.

### How are you starting LocalStack?

Custom (please describe below)

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    Localstack testcontainers 

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

   Call copyObject/putObject via latest version using AWS SDK V2 and specific a ssekmsKeyId.

```java
final var copyObjectRequestBuilder =
        CopyObjectRequest.builder()
            .serverSideEncryption(ServerSideEncryption.AWS_KMS)
            .ssekmsKeyId("NON-EXISTENT KMS KEY")
            .sourceBucket(sourceBucketName)
            .sourceKey(sourceKey)
            .destinationBucket(destinationBucket)
            .destinationKey(destinationKey);
final var copyObjectResponse = sourceRegionS3Client.copyObject(copyObjectRequest); // Error should be thrown here but localstack does not return an error
```

### Environment

```markdown
- OS: MacOS 13.0
- LocalStack: Latest (v1.2.0)
```


### Anything else?

_No response_
self,
        context: RequestContext,
        request: PutObjectRequest,
    ) -> PutObjectOutput:
        if checksum_algorithm := request.get("ChecksumAlgorithm"):
            verify_checksum(checksum_algorithm, context.request.data, request)
        response: PutObjectOutput = call_moto(context)
        
        
        moto_backend = get_moto_s3_backend(context)
        bucket = get_bucket_from_moto(moto_backend, bucket=request["Bucket"])
        key_object = get_key_from_moto_bucket(bucket, key=request["Key"])
        if expires := request.get("Expires"):
            key_object.set_expiry(expires)
        elif "expires" in key_object.metadata:  
            metadata = {k: v for k, v in key_object.metadata.items() if k != "expires"}
            key_object.set_metadata(metadata, replace=True)
        self._notify(context)
        return response
    @handler("CopyObject", expand=False)
    def copy_object(