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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec36aefcadd584fc7a43b876ed1e9b15f6cc1e0e93b094b396698e85265820b' 
  AND token = '5+EuPdRV46IslI5+wAi44qlHjYyCfQyjGi5gw0b1dUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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