SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cba5732b59cf066722a63e269e9f0efbaf8d82b98766bc9d1dcbd42c35a20b1' 
  AND token = 'HAIreMMGLcM2+zn88ghqB+xNSEK65AYUhSJbGzVXYbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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