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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ff089ab1a98805fd9820199c3308372b265b62dd883e0c2c5368214aab1771d' 
  AND token = 'x/66W9c92/KQiuP2+R0oMMVNVdB25wQRwRUjBYPbZUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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