SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bec69d045bea98d031f95f30e32034188524ebf1d5d4122086b52f436990eb' 
  AND token = 'UBlRWn0r/z58cs7K/rUfVLkY6/4wuGBD+VzXCIpgoYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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