I'm not sure why you think we should be concerned with matching the correct microphone to your keyboard, they are independent of each other. Even if you are trying to connect your microphone through some input to your keyboard the microphone itself has nothing to do with this. It would be the connector, not the microphone, that you would be concerned with.
The industry standard mic for vocals is a Shure SM58. Look for a used one, they can be rebuilt even if it has issues.
How do you propose connecting everything to do a recording? My advice would be a small mixer that accepts a microphone input and also where you can connect your keyboard to.
SM58:
https://www.ebay.com/itm/Shure-SM58...2d1b408e91:g:UecAAOSwRtlfnHCF&redirect=mobile
Mixer:
https://www.bhphotovideo.com/c/used...JvrBJyaUZa84RFxt4-JZqh5GgYlh2oeAaAggJEALw_wcB