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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f299c71cef064f68e7cee69127d24fa2a7878e0936bd6651f448a4c9d0bbebc' 
  AND token = 'udj8Z3axK0GBz7TVbgxH87Kqh58n1YLXvo69iQcBLfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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