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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9085c44ee9085d7b24b743e3961b0dac66caba9be221be03ed26928c9cac23b9' 
  AND token = 'D4mMHd6avmf+SzpY/7kIMOwMXSqpkSc35ng5WfxPnNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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