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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d84e8e9c93b84a2dac2fa74f030a9e37cc31c92ad4f1368a757c6b07aeb7b7' 
  AND token = 'iXbBB7RyG3WsV5U9wOccT4nZ2ohGRlQQX536LoTXWZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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