SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c452d794647459eb319890db2586616eca267d3cfabb5ab1a0b7e8eaac873deb' 
  AND token = 'c+uEoO3nvzWhtL6l9AxFcTUQpO8f8rIcTGSFsLnsfTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

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