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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64df51726ec065c29f95a97075b8ecf89e81ff61a2d15123a9b70507ec270ba' 
  AND token = 'Ljokbbeomurko0mmHuNGnOiB2JOe4hhqajJMi+/HmfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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