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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a3492057885eb5710bd02bdc63163f3e0c3b749abae725288e8532d23a7fed' 
  AND token = 'gCGmo+e3nIHcoE6NswR+9i3jrUoMkDjVmZO2IxPouVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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