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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3cc41e5ab38b20f40c80a2240b72ccc55e9b51848024e026eb3dc1805c69ef1' 
  AND token = 'SmQl1g8fkttCRXwaFn2Yd5NC821eaTFGstyZ80P06JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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