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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab7e1a9a4c5cb87f04646377b1e62b070046acefd9938970061344a2ec69ea4' 
  AND token = 'nUPuuQaPn/xzPVvTm3hNikj6kSV36JCl0lvNL5A0X7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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