SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a907b4fb482e483aee262fc0aca5f835d1217b37f89c79d59ed068b74cbf75' 
  AND token = 'ZaqvKV7qNjeMHNpOw0ohvP8qIvqMny1lXgVnGIWiPVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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