Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773640fc3a5dffa8e51b995e15954202e7baef268d8d49399aec91ea62618fff' 
  AND token = 'bmOhueYFH0BizZeZ8JKo877t6sBgJeRtKUir2+kM0bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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