SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a06cf83492edb2f2ca45eb1fd427515c2485bb4b4615f1f4cf3575339e6dcbe' 
  AND token = 'VYA9qqBLk3h3RYkCKV7RfKsRjIqQRQK8J8RjpjxPjVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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