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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e92f09edb7eef6a144f456b5b48120b914962542ab853c4a54ea6c2850b1f9' 
  AND token = 'ASWKNy+X5AnUcb2DJhkDld+iNEigW0JeODkjcWbzMvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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