SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbd2f25b8db95e2230de378121d5801bf3d8f25afdb981f0ed1ed6b79273dc1' 
  AND token = 'KaBtPcWILNAUcXXjztBcudM25tbisoI8rSDHtRPYS6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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