SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65914e2b514c280b4e7f7fd2d055f73d46bf1d9412d858f522a7d3e3f24186a' 
  AND token = '2Y5sMqwtdLiEVC9hiXeTPeWGg0BGKjT+CkdCKlxAKbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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