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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c79b28cb9135088cd9725be69a603e8b05b6e79babeaf659c9bb4085c43427b' 
  AND token = 'xw4nrIn9b/jVrKL+QRnlci3M3u+MOoOX41R9AcwRuhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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