SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06001d44dd7bb34be31b9a14a76ff5900072c2a4b05e6abb036bbbc951838311' 
  AND token = '/VJd3BxYJQ3SqDg3fAgKuLY6hGszGN8HBMau/ailn4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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