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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ed73f5c0d73de269d6f0cdf6d606708e8d80eb5f6d4178f2473cfea28cf779' 
  AND token = 'sIe2hjbqJJYjctxmh5VO0wup9hSf0g2qWpIwYYsv93k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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