How Zero Crossing optoisolator to work with 220VAC?
The maximum current through the LEDs has to be limited to 60mA. That would not be the normal operating current for that optoisolator. 

The 230VAC RMS with 66K ohm series resistors allows a current of 230/66K = 3.4mA RMS through the LEDs. The peak current would be 4.8mA when the AC voltage reaches its very peak value.

These conditions should allow that optocoupler to work just fine. 

Why do you have a doubt about the circuit now?