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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fff7b9558bb45e90144e9bec2142187c8d857217a5bf163a629ab3e665c124e' 
  AND token = 'TkYUSRZPnKrjHlLFcXajB0CopoQsK6Ol5rDS/nFtbEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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