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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705c847cbaa59eff63829d1b6950e36571e37a70a3bd1f71dfbee7396fc4bc85' 
  AND token = 'JrpQz+FmR41Qj8GXAA6rMdcfleuoCE2QeowpUvGrwk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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