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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b4294a983be726a7af5ce5b25f24fcca6eb1f67d5ac29df6e97d96d9786436' 
  AND token = '8L6Ys8dx7c/BvheNMqLmUFcEiTu+P7HUvBN68ub8g5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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