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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdfecf65b8cb4398c9ad28649cf87c068acc4cd0cec387d93b88aa5e970c741' 
  AND token = 'NO2EvME/8EkYnUVvKCFrL8HPIlltPnKz9W/w51NLPyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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