SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c754c8454d1f178cf78f9f45e479824a21be6c3422259f15426189dd8c79ac' 
  AND token = '6NunSwYP1o1JjGsHJeqJrHrOIKgWThyIIgpx1/UUW1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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