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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea06f4a83ec704b66c9389c76e310bc8acbfe2b518eafdd9fb0bf22439893df' 
  AND token = 'UtmiC7avnsxCdi+NCAIMvlLnzcq7juefTzKdE65aBHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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