SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ac664f1736ad00425e54e9f1362c788a150967de6bb4b81049700fc241a7cb' 
  AND token = 'VuRRt4K9fbvV+oiqPpHEIQjrJXD5Gz3xV3sVnSogQVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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