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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cbf21e5320738cff72496f0fd7d602dfbf2efd97c0a37f7c3d7cca64f10e6d' 
  AND token = 'V0RwGMeBJINWJ8MzwiaScsxqe9xZt+yY2yhg2H92t/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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