SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd011ff0633a0435b353c82c352ec98c4c93ca6b32df745fae11d6952c3adebbe' 
  AND token = 'qZ7Af7wfhSX/dDA/cJ+E80C7ZAa5VL+jWsjFz1wB0GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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