SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf51bd08015719e31597f171f590d3a6e0a4e49301563bef5460beeaa0c07fc' 
  AND token = '0aA0ay26ez+VwVSzLq1yakj5HLFPCOi8FdKIcMTkuxw=' 
  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