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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c33622ee386cba009c291956ab51078282265b65e2e01ce02476af9cf34cd76' 
  AND token = '5tZOINxVNyjFZIFhmkwNQJNvR7uI21CfYrhLblQNDt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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