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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0acaaa5ba4303888c9f8848e3e1130538d54fef3a5213ee9f7754ba78fb64c8' 
  AND token = 'VsR/94voueayObq65Zqeib5oRTY6Ex0vDIk+LQGKlwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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