SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32937f2d849d00bc0fad0bd80c8ce686a02177a70aeb73f3ec5b646b124f5f58' 
  AND token = 'zXPXa/1ehFVlXlJqCzx0vvJQgo2bn5lOYaL8B1VW1WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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