SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf69c00d520102a17a21a582f9271ff1a3195763b1dce9b0e21c28cbd034124a' 
  AND token = 'r9RCH068JrImmmCaY3RPrdm8SgPn4+cbit7CkVWhPCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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