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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73ae1e475ae9eef32de188ebec8334423fc0dfc10db6bd26693556239402660' 
  AND token = 'XcixKlwmr1nogpgkvcRAZaKGWE9ts/KhLA6x4bq/I+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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