SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d22b76dca73b1a6bbf7f25a4256a6e0a37b8878260cf5156db7d440b3f72c9f' 
  AND token = 'sUOQzlOJKQH4UpixjvY/Y1st765R3uQdsnqAZA8zESQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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