SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed609f98b1489f4113aae77cbf63540c0bd240c364b57b8295982e55b8da33ec' 
  AND token = 'xJhBh95TWMxAOpQ3YsVLg9KNlLHGUd6BBe6UYrZ+g+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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