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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c961c0c255c2021fff810a6ae48ae850f9af759124b6918808380599eb911b89' 
  AND token = 'HoO5Hytyv/cp2FbT6Tp9xjB44bQtKk2GIh8YlHHeDpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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