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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d5da0fc95c7acb3dfe5ebcd1bff10bd84d0cb17c728b79e285c08fcf8b7410' 
  AND token = 's8/N59EbJ4rQJ+gBK9tN4Iqq4crQURu0vtbohiePWxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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