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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711d6a768e49ae40e1fa488782b005d2bb6facbe5430ed9afbf0336ee1f611a8' 
  AND token = 'AkgZYUYCwREpuiB/YgLY06IaOONBFxIzfNov2aWcU3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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