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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0e1dadac799d8e1f18914a9ec98f0fcf463c28a1ae68fc570f0a6689cfe8bf' 
  AND token = 'SrVJ6UWY19fmCfwKzGzDbr7FWbxZjtMf2wBIsqB7u+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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