SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb6453751cfc1f981101e81ca4f19fba4c7dbcf629c9e986d272a9b5f1948e9' 
  AND token = 'V29vdkCoHVr73QshixOK4mqpLl6MwzbJ+XA8fjJ6mnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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