SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff4508d103a5bed6e22b03076f18a4b09e7de974e7b7c9a00dd0578e508c72f' 
  AND token = 'NGl4wuoVXUsz2MHuYZmTVnD76/knj9lBbgRIKD3Ym1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}