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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adfe743c9ed0ea8a00f853ed14348ab6b4cc92caf2ce32e582701b8773d8d93' 
  AND token = 'CSsNgQJP9iBsyyxxe25KCUdIX1z8PrcsBAG8TorWRGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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