SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8638f3afd10b7bb7eb9fc727e9a43702cfce670efda0b8487e53efdb5d601e' 
  AND token = 'AqwZQG19Kl5cp+EvLRlJUD49KziYpQgnwsL8mSMX5JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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