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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef0e74ac7225993df33dbc24eb6d1dce21c82098dd542ff3290be0d5c4e38cf' 
  AND token = '8ibAEQBqLjk8M8hPOHbdoUpDGztiBsE8yDyXpBgKLWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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