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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380bed6c49da933fa2697a7f70e18e5241dcead50b1ecb920a4ee6365dfe141b' 
  AND token = 'yt9DKuuFzcfCfNQx4g3tYwdnWV5HYVL6dRmWVOkY93E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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