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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e909d607e632e610fd698cf9392d471382b34ad5696d89f45954b882c368c3eb' 
  AND token = 'H9UWSN8CMnSsZQWDLsb0sGhgKWe1Me01AOYBQBmuOrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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