SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e040599a45f44fcdcb3e5260340ab912696a0caa87c4f5736bc85da2b0bd8f4' 
  AND token = '5g9H/l8CA1dvQvwZVDpMI+PYKXcQMQ0hM9lOVfKEFN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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