SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc911f22ff3c049dd4f13ea3870fd11178cceb5692dc29a9fbb246de067196a8' 
  AND token = '4tDvhWPpY8zshhSiGSV10J3qjWWFPy7QIYGFkBMUBZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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