SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28c0ee3b5d6df3e5c976862c7552691e826ea8ddfd8c615eb16a38dc41b44a2' 
  AND token = 'yJKGaKP/cBPf7AWb+7Q7tXD3a7Q3VAKDjvvZpJwoJiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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