SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3310dda79b4129be7f45fa6d4d385ff5bbaefe026a15b2cd47d65ac99b208cd' 
  AND token = 'rVjLfgxSm8rbg70lhBBUxhLw55lKIHCHvqeNWvGIzjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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