SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1f122ba0bb28d4f5571794689fa969f047516b6a6ed32ef8c9ecf381ef0a50' 
  AND token = 'JLdtdGrjgPsbouspeCLssjvJiTgkuAmNcvTmM/VIgmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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