Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9d100d4fcddcbaba06ec7af5d4edb16ed11e18f59f5ad0d02e0a337b133c94' 
  AND token = 'R6gG898yKAnEvOl8MLvQy4xxB4zqi8WcQ+M/mzWHG8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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