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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60e782be452a42b25fbef71f93ebdbc050afe229b7769b7762f4cf00e561dcb' 
  AND token = 'unpLZhWi1PEl23vbCeZFmRJFbzDW1MqnJP74wUe8lic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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