Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83624d6390d45e114500ec0060c27e63cbf640bb6bbad26ac35d5fd258ccac29' 
  AND token = 'f2JMesAhxMUcYyLYEuxb1OGTx9yqLZYBM8oCSa4223w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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