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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bcd2a8363a675a488fc9b08d9a383ee90c0c6a1e55506b77da1b56f43e663f' 
  AND token = 'dbXGct1/OneJi1iP/oB9Tde1EPdNicm9m6QHhLOyhgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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