SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b40e718a2dbf442f0257fbf5bfa37fbe8b67c7a890ac63b053d80107d0d53c' 
  AND token = 'y7CCjZXQMXvrXYW5atkq0+UxRvoVzseKIwNgHEVwuNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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