SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb691366fff06df4452ae028d75543b5609f8be0d04ba7c22cb8605bb8f7cb7' 
  AND token = '105MBJ4+fc0YH+JhPIoT9nweih8HvfZ8zMgi/woj/sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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