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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6811b350c079412277f1ae6f20a6d10781068071abff8405c85313b87a25ea1' 
  AND token = 'tBTQw776+rAxnK7b5k0/6Sc2KIo5p2PBnvjJkTHRNrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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