SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e1247284c2294e46d97757b383567a1ef16f94f734c0d013ce353eb9f1c3c0' 
  AND token = 'ESbZnZNw+vgVP/4WXtodWT3vkqeE9ylJKZxujs5zGGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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