SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09341ee5cba07579f34a8184e308d670b3f836e321540742ed35f4409478bc85' 
  AND token = '0BqpKOGAzGsh3ZpZCntpC48thRvzJEIJyx+u0Q6gJ8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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