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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f1de20dd8bb6ec3916b29da3b95a3f8ec9524db13927d21c2ccd5cc88bd6e4' 
  AND token = 'HYP0uyBnNH0BvqGeyzXlsYG3EXrMEoY+rwSKxjiM3tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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