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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2147f8aa11d97b4fc10ec74a6c93b4346986f0cb4d5658718a5f1803c86c92db' 
  AND token = 'yjy+lXz84tx7GydY6J9qCxdI1EaE6jRyrbpv0qBnH0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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