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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf937a36014740261ff0ef8d2f33cd8d14ffa1efe607e229ef4efb93bfad7ae' 
  AND token = '9ceiYIifxFmu3eswyg6V1mAeBsPI/99JRocuFlvpa2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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