SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc443f669417b160aec578d634b755f99a48d36638cda9c4ab8514e9bd9959e' 
  AND token = 'DVqeiiv5H4BsX3TYVkrpTIKhO6yu6alIgjnlKDPrWAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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