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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10edde6f303221ee96acd9a211f83f1f96b5f0cab9f1ca31ea29f55cc148c5f' 
  AND token = 'A4FDVrG9/IWM/xUU4ubdmg6w8DwjvBVOH46k62SdUvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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