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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a0518a3421863d150fb9c864d68c1d1881b16e630eac430e3396e9b8f64432' 
  AND token = '4JSfH1z+pYNn0FdObg+yM3G0KtRfNXCMtVuBrgfJuqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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