Hole in concrete floor from floor anchor
You'd want to use a products like this:
http://www.homedepot.com/p/Quikrete-1-qt-Concrete-Crack-Seal-864000/100318507

It'll be hard to get concrete mix into such a small hole without leaving a void. This crack sealer is designed for smaller holes &amp; cracks. Documentation here: http://www.quikrete.com/PDFs/Projects/RepairingConcrete.pdf