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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f521d2e65c0379c3fcdfc844d3944aa883f2dbc3f7a0df48d07f586e2a43b5a3' 
  AND token = 'Bdf1uiuiYPvpCICjfd5e8h/Im/5dZU07ZaEmYClyteM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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