SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb41316829c732e6f73926ea27b8405a28f549ef88bdac3a16271f981c0a8cb' 
  AND token = 'le33vntJsPfazLzrd+TcqEVxGQhgLK80ZOfw1B5gOjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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