SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c4165d228899e7e587ef8cdf627dd5c568c0b5ff5f1bf380b76009e568a208' 
  AND token = 'FBzvJsBgntdOcR4jFwtKfgpRgPkvBxlHm8sO7JuVw3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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