SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d79e3de5462e8ccfb894ca067862dd36ee65ab28cff51e7f4e0fbf4efeb973c' 
  AND token = 'vVxDHfLEzZj1Jqy3wQkHshV02VVS1+WUU3gn5jU/Xvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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