SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021850a963a74636474c6cdd7f1b1318db9c22ddfb851073d3ce8c9b980ad616' 
  AND token = 'jpNXdgF72XU9jhk1f6Q/bmIBZ6UKpVtCefQFX7+YGzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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