FFMPEG - Crop and Chromakey not working together?
The issue is, that you reference the input file two times.  

[1]scale=1612:906[inner];[0][inner]overlay=154:170;[1:v]colorkey=0x000000:0.02:0.03[ckout]


what you actually want is to use the scaled version. so:

[1]scale=1612:906[inner];[0][inner]overlay=154:170[ovout]; [ovout]colorkey=0x000000:0.02:0.03[ckout];[0:v][ckout]overlay[out]


But I don't really understand why you overlay the image twice...
wouldn't this work?

[1]colorkey=0x000000:0.02:0.03[ckout];[ckout]scale=1612:906[scaleout];[0][scaleout]overlay=154:170[out];



colorkey, 2. scale, 3. overlay  


You should almost always colorkey first and then scale to reduce colorkey artifacts

Greetings