SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad48f5202d12716f3c6dbf899e73c0f4824fbb224223ba3a49e6520c1278d5b9' 
  AND token = 'r3xo/1oza8+1EdGJNLUrqCAS1EBBVw05Jz4QYPttg2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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