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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482dd7108caa9483bec446363e52ce0374e28381f8d9eee1674febfa3119e86c' 
  AND token = 'XYnmJOeqvCFVcQslRAWWmOWqtX5TBF3NUsgM9qIljyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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