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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b76e177752315c7783e88c35d52cd7c2b4374b50ccc97d5cb1bc941901a8846' 
  AND token = '0gGkTzqLwrvJqIEyvRWIDyoix4cFWElHtaRX9mZ3m38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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