Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affe4c796a3498f458873447111862daf510d86633d6f0e9246d4579ef41ed15' 
  AND token = '+BwKS6NSSQuR9Y/fHjLYsK+seCuLpvpLHM1eo3ePBt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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