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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db809d6ae22f8f6f9128551fe7dd8eb63a690ff514fb1b8f2e0bc80231fee01' 
  AND token = 'KwwseBIFjbBtnNE9FkNCc/Z3Q5mAcpIu/QRVG+AInDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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