SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b6cb072f063777c5cd91127e4ed70f242dfa4c8ff7ea62da8fc44338c49085' 
  AND token = 'lmZpChGqQqzBX8LO2F2m/2pvBag/RV5jWvTvgsBbO3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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