SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad60f69f40ac94874294d3b1d81bc3b1bec572446cd890c4557c5cb9d3f4ebb' 
  AND token = 'lm4QLW8cJi+IUWRbvymJK/4W7lkaYRkJIyMvlQVLnDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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