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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9b7f0123c3d952f42c47d39048dd4c9812aef1a8aa170204ec2ddd0a9b3892' 
  AND token = '1Kz6/s/HtBvw4esk1FwlpKX9ABURu76A5IF5PVwBYUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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