SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eda2c25dcbe243283cd3d19a303e2fe532baa38985696c5d7a372b898847dd1' 
  AND token = '/V6yDNmq36PO+BXg6UpF4AzjZi41YYecEYwsQRDJIvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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