SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8250b98cdda2f996f65f8c9d9300e2095ffa33db72d6e47acb9fdf96909a63' 
  AND token = 'ptrlJYFVm2Co/IZSLwz0vb93yBnAZdqVWqneYiNQjvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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