SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b6a39e1a4b0da2a66f3f8df0873dae6dcab5a27cb26d6a8a9a30e6df2d5406' 
  AND token = 'zF+Pab4tBRL/7/wV3mm3PySQeuEDKfbRnl6sBEdtYUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables