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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73479537205d9b5c87f8110787188c96f891b72b0689f9e2391ffcd874e8470' 
  AND token = 'sYddXxiuIEoJvXx9au+LJrzPozRGEX60b3bkWd/Vj4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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