SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985cc620c5679c4610459095f0a46ee6267bd75434b7417b8a59816f140816c3' 
  AND token = 'UEdilBxfxgu6J/VzXMoOhbrS/FsGjca4yHDYULFifGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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