Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ff06653bd93e5bff2f1a530e887ec9710b12c963050b3fa336d68f925eb45a' 
  AND token = 'dZ2n35j18/SDtBYtwPXZ4ORxjuYbbn2LywZnqWx01Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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