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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1655cfc0c8c3e093386f3ea6dc5f75971fa8c2a52541bc5416945691f253b3' 
  AND token = 'LhC64fnN7u5jUuCiKhlONPznoidOfHIK8RFvk87S8rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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