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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa09afc076504db995792ea27e96ddc72bbf369ae3d91d9596dbf69b75dc4e6f' 
  AND token = '/CaEwGwEYbXhGcRWpHW4XFPWkMhPrehOb0m4DCbaciY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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