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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32ed09d885cac815463dcd940bc802c0ec67949c33b345427f2eee7fcc53d84' 
  AND token = 'vVyA3ql236Jpxs5e9W32zp8zauS3kZ6Uii8BoUMOMlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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