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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee53a2b4c85c5d80ad7727d4468b3781290900c89deb1c3b6dc52a419d2ceec' 
  AND token = 'CFSb//v5zc7WqdG/rwMp25v7PuSHdRj9U/vevmc7zfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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