SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf41c794c28b3ea116bab18f0e5ac2aecd451b496469724d8af9e2369720d14a' 
  AND token = '1JjoOZQINUZl3g61qL4RhGvbv2xtv9ssrVhcwIYKZJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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