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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f770486ee3d838455b356a198f5a4bb9dbdebb455afe0ff1bb7943177f55dae' 
  AND token = 'tto5M4SDhcp4Hx80QEtBKDMdzrmfHyuHdgGxUipoNpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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