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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dabc2ec23aca80cf39ea17f2ad3ac85397674e0bca9eb87a1c982aa16d625ef' 
  AND token = '2WpwyUFQtZZ7E2MTCaA/4J6Bw7nMfB3np5ljTHHwhjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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