SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f323aa24089dcabf47977039f9242703406dae956f8c1a9ce5f5f5c0815eb5' 
  AND token = 'BhH33Gx6pYG4xw7vwmD5bfY++VsRz/JfyuvvZ+tdA0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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