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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bbafd6bea210de77390ae66855de648ee4cd20014b363f1f071443379fbf46' 
  AND token = 'Lpcw58Uf6v5H0CBy78wHV/QQNzfKrx1gAg+tVrnFi9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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