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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df2ad86de6a057cc8b34ec46459f1baf42ef3684b6f4c8e468f09bfb678e269' 
  AND token = 'AdZZn6kFth0XufkU26iFeSyKO6aXFo9D5Ypg9F9O93I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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