SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce34be313f17a0eb265d4f80a4547d597664fd3147a5d6411d2f7e893278654' 
  AND token = 'uR0TlGK9zb3GNx6/cw3mOYUGsrrTb5HLEPUFJspdClo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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