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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29ac688acd60b297cd42e9d99665c958d26c87adeba1c11661588d6bdd97020' 
  AND token = '6hEKIHVoxy5EUMxZrQJ+xMHd0zhTd9odKtKablLDNrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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