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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb0aba983b172989040e797d91c0e43cdecf5019d27ba7b34bff18f3e58362c' 
  AND token = 'tFq+vXHZ0mogcknOu5lI9IC4ntr3mILa/H7lJ1ckw+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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