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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3285b236f93bdb6a012d515951834bb3191f95839252b8645ed6ddf84f4cd4ce' 
  AND token = 'FDZ1JON2tXuJLqHgbAL6F4+0XoOk3gz4ZEQv5uM3y64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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