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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636c3b0ca4c9cbbbd8602b4e2a2588734f680585e48a9f45b5489b30b044ce6c' 
  AND token = 'QHlq0cIY3GUIBt6FSLlrfvVei/7c1L26sC3QQZZ3atA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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