SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf2e9eb5a59a1862e18ffc5deda38bb7224bcd54a83a8af469987f8c8972661' 
  AND token = 'QLWeKZRqOkLsRjh5B1xHhDByGmfYJnwrQZgIuZtRqLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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