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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8553c728f5637c1993304b0424d76acb393c1be501cde8196f83dbf0f8bb26c' 
  AND token = 'Vp2ubkE/bus3y8t9Md35xh11nlhmWBO1PyiVTw26AcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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