SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffc7895d0d7c6c682636f36339b277a4be08a46f31dcfb2dad90c78b34a5431' 
  AND token = 'vRAb1bB/qwDQ7+p/329Cu+gJ7uCe43QVl96XgPJNOjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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