SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0440bfec8b0c2469dba1672799ef665e02cceffcf6a1a65d03492ad0904c0fe9' 
  AND token = 'PkQWAA0KP7B1Hi+5MV2556smdGI9Sa1iHF+cRsPt4nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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