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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa5324e1bebfe7608a332c283f5ff4dbe8a69e53ca8aa79b60b12257c399fc9' 
  AND token = '/GoNRPa/gJ8sAtVgLAraWKi1C/wf9Fff+yuIM+WRd3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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