SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09de5bcc4c492b34dcc6318c53b4e6827f738ed3e131d37dbdc6a02293e655b1' 
  AND token = '942IXMfTmnqBtUhnFV9lqKYuq/QjIkJGb7XvxtUYY6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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