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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97c79f248160aae9cbe013d451051bbb7b3dff84ddb9f1381b42e44b70eeba6' 
  AND token = 'ggf8hmoFiLxzqmFcrUbeQKTuqipZsGw1H1jcz5X2iok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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