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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ae6788945dcc0267fd693d816d8fe8f318ae3c24e39077c4f5719ce7747141' 
  AND token = 'WebEI8BdNT7wQESrJMB8CvRj2Z/LDlGeUslEepraids=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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