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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f70d5ad4563e7725c067bb2517d50a43392cbbab00eb0fe083a7ed979f9ba90' 
  AND token = '/de1XhMdmCDlLSK8EJs2nLE4vy/cWi3dxUCspLVS75Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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