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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a40f72076c471dfa11444f9a0d1ab42e72752c828de4db37a81ebea6da193e7' 
  AND token = '/IZL4+qNxzBuYuqOuJXq8RwO6opz8aSDAFf381VLqbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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