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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd717b65b0f383157b97ac4af1f00ba5606d70eb8800f62141327231a639d88' 
  AND token = 'HXqixFfOFna+IcX6qeqLj8mYjRraseHPRk9oLLg5FyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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