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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42652c9f69634b916fa04e7935c95085aeb712ae5dc5ba02dffbebee02d69b29' 
  AND token = 'J7TxoXAPPiFMqXENfwJWSaHvmlBQRVy389Vbu2WL9j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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