Hi,
If suitable software from Canon cannot be found, and in case of a problem with the scanner section only, you may want to test a paid third-party product (trial version available):
https://www.hamrick.com/vuescan/canon_mp270.html
The latest Canon printer drivers appear to be for macOS 10.12 Sierra:
https://www.canon-europe.com/support/consumer/products/printers/pixma/mp-series/pixma-mp270.html?type=drivers&language=EN&os=macOS%2010.12%20(Sierra)
https://www.canon.com.au/printers/pixma-mp270/support
One should perhaps not rule out that these drivers can be used with a few later operating system versions as well, but do not expect this to be the case.
With a compatible ICA driver, it may also be possible to use Apple's Image Capture for scanning.