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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a36d32dc6757277cbd6b3b88d91a967bc1952552b8da8c76451215d9e8dab8d' 
  AND token = 'HxoD0QEDwKcdcImTkC7GVuXhOP7qbLWi7AzuXwwzkAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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