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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc6f2ee79d9fa0534492857d30a60a69da19307486b117d0e3a03e538cb00d5' 
  AND token = '5ZYOZJJ4Pf+itzVa+PivIzaXM/XXvccQtIbilCzI8bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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