SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af48c27e0835bd9e3f0ef3a08927e979e3127719570ce315a961d162d073bd81' 
  AND token = 'xDKvTXc++YCN25WuN/MtqCBlKuYFJVM7yZ6WOLwF7zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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