SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a15ec1fce96b3270eae7ce8d7c4d846cae61bd4f9e7e89c74317d934e9c0fad' 
  AND token = 'yIIBACn9z4UZ5qzyz1DVFrUoVzi9uS+7MzimnqCB9/k=' 
  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