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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed9188809381f00a37814590bb3732efa9d168cca85efb6a6a7c52530a09a34' 
  AND token = '5DTy614vQ54xSsjaLK9guge0V4k3u/YDFQL0PAtxrcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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