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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026008f744fee98c4c6ac6e6d5984f1db62caf8a4d9757d797f7ecf0718a960e' 
  AND token = 'aZCbEoarHl7O2Q2WHGywsQKvF7IZ4ZGe3HjP8TiquSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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