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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267cf855234b05e73c7e6cae73b8a8b526f29ee5ffb2bfb2624fd65a89e3f405' 
  AND token = '1rSuT8cYvb71SCwgDzVEthgXexB+zxiKdmISKVtD3+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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