Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5868b9502fbfd7df00fafecb3cba53ff17b7f901a842d25d4649266a29c39c15' 
  AND token = 'IB/dFbEuHa0EI3NyQToOeVTTxJj8AO7R/5z8vjENHVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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