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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72911e39c92f52804c8ba8a3c20bca72b9623c4a8df50e039470f077dae394da' 
  AND token = 'GFqFt4aNvKknNlWnV4Zu7kOX6LoQelR4CS0M/ACkjtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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