Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6061bfe64680631784715b5d4d6a684d734511844a1717deede80d16167b92' 
  AND token = 'h/yvvlYuYmA+3m70cWCdPwgM6t9jbOmJ6HAaKQwWgWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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