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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d6dfe525ce4a621068802e4bd8195181c5d6e7a60141d0ad3c3d330747b9a4' 
  AND token = 'VQWzrDfGxnKbqxJK+7D4p7fG+jep8zQl+58dPcXVouM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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