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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fff67afd21382e245b08c0d397028c7d48b7e94ecc795e8e0cdc830545f9a1' 
  AND token = 'Zsuvhr6ZkiU/s7b7iCZOHgdpEmsxjPFg59nZDYgKnnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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