SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1aa00ed19f62ed410589fbc20ca8981a58c4865dfb1ba96271dd590824b081b' 
  AND token = '2E7mX3N7yVwu0/uDXAw4/qnsZ595FTKcQlNf+kJyhOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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