SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447c1b64ba3af167b11900efcf0b1c5f6395f8127982a55a25f2bb6c31384a6f' 
  AND token = 'LEww+tNnDbfVdGSwLItYWRX7WMwBVy1k8SQGVeEu63c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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