SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2297f532d5a2765b94da9a14ca2a149b4816a3bc4ba3d7bb6c23d74ed31db0' 
  AND token = 'kq5GVpL8WlL7KfK1wY+L8Zl34QNpxUXV3GVKgH/9MGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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