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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd561f383ddeb1a537b4fee8af0f34a8ec94fa37531e182e8c1a5bc475ea02385' 
  AND token = 'NOGWa4YO6EpNescPktvDS1RJj93uH3hKUrXmYVgWaQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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