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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864f11337ef60175278fc328bd7d0d914070b1c39493f719893c0c4e294d6708' 
  AND token = '1z04fecENQitISW5KuQMHGVJ7SlIS+mxpCvtKLaAnLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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