SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20291f1f78a0ed094f093899a87c61a6bf3856c70dd47a2d18ea74d797135e8e' 
  AND token = 'vy8sZyvJWei4wYIHEOpQ/kWsLwmLZ8/mgqffVNGtPO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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