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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b926882c18e1c7894d1344977fb3b5d9caf8a88a025472ae237eb298b758d824' 
  AND token = 'XfL6zvg8L3JAbh5aUTVO17tgB0dkr6aI1gyY6QUYYzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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