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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897a356d9ba0ed0bb6720412fdef93147280aa6ea77381cc655e4473b7ac5d90' 
  AND token = 'Ll/laZ4IQuwXWpvJjIDL+n65XYddZt7EO/9lNNEfDv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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