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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cce9a14e4b3f287f673aacefa0698db36c57435141253d96c7d04cb38fc1d0c' 
  AND token = 'LyH8gI6GU9OEcZkTNlxMYIRC0Wug2jNU4Qavgaht+Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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