SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165926c7c8b7ee037a95df35e9c129779deeba60c118678c214804b94ea45c32' 
  AND token = 'mHyr5WwLKHIaJxZyZNSpvZticvxLzGLh/3jikPX8yBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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