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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7d596c56141d67204d82314f37416a46170ffbac1aa1e6e97a5a7f4e3ffb55' 
  AND token = 'ksRUDKy4rIJv/Kud7OqadJmD0BchgHr8kz0jTaoZhyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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