SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db59b4309e2941f6357b96c08a48efd2fbb82449792621efaab27c8d24c2fe8a' 
  AND token = 'XD/jfCknJmsYPBs9vZ9sWIXjwA0NoJVj3wSv9VAcZJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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