SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c31f68e7c9367e8cbd3f08cfe352e258f56a0212cf395dcd4b5dbc6bc5f9d7' 
  AND token = 'bAQ87Wh51yvn6+AHGKBHNJCz9UzwljwG3m2pUc0OA9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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