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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036eb31f79a28d56a24edf4718b7f3170c086f0bef5f7e43c697510bb591947c' 
  AND token = 'WhcEF2IgEfEgTyd1oodPnNmYH6RBQTRoQbpBmpkOHMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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