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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b7ba412a36ac0dd4c8a57f9a9abdf9b72c518f85a3fe7788916e3fae1890ad' 
  AND token = 'AEbw1m86W+7ttqRKgLo1LEf/Ixf0IDf5hVWbpHrEX1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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