SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499637ac947d6fecd1d3e186aa9cf14110e451d8da9daed185f5bb14fe43ff2d' 
  AND token = 'lX+D+M/K5jISyUmB5Xvr/6dGDJmGvf/to6YgdVxQwUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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