Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a724f6d6fe994811aaba873a784210a36a202918dcf670c2ab726ff82f0afd0f' 
  AND token = 'jMSrTGYftynvx2UfqG4JPgMlN8y3NUtdzaLsZXQHisw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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