SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3220d4d55e6ce4ad915fe6c43ec5d4f412698dc5fe9db2d379f6e9bea4efc5e1' 
  AND token = 'Me7htb9mou2/UPtNKGgMsOFKoPYVJn+AyoZDzJhj09w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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