SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a2b4dda58faf97c9c208c7e224d12d1f637e9c7c6e638268d9d730e83fb9f0' 
  AND token = 'YLDPVRGbPJzu+PO4/zCfGyWbZBTvkrzM2QqVCRgX19k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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