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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf33431d9d356696aeab3bbb49c952cb562164dd22cfcf3422bb0ae868dd0cba' 
  AND token = 'lIlNbGnsJcywhdwXWe+aivZp/YbYXLzXBD5ol+goUFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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