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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d27f9a42f3f492972a73f6564c96199983a21e168577671a34fb7932074dad' 
  AND token = 'q1icKh74iNhGfC6jxH3shM4i65lWj13T8ZmKX6lE/rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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