SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07430f980d40b970a6f896694572e32e0f22ea833ed244131b91e41cea564ba5' 
  AND token = 'XgwVGrsLKQMBurtPZyI9rsWUDFyhsaTxh/Q1cTFcgv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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