Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e651499d52968c1fcf63ee2ea8c3570de1a26fe0595e5ca1e4c8f51bbc2f5a' 
  AND token = 'WsLrr5OBzAdi+d/CLzrrlVjMiqDQJsPwUDqa7bo897Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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