SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda5e374bc4c08851018289a884d958461bb3194eefa4e92b91fd6c66ecfc1a2' 
  AND token = 'jwvTZ5JZT+qdUdipZLzuVK4P65toFESj+tVTSX/sNKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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