Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4803b9ee6a18dcea4bbb527834ffb509dd0853d78ef1cabbc8019463456aa3b' 
  AND token = '+fHUu6M9TkEZH84zwSZcFqOCgk1nDLcuHzRvL8IJioM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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