SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74db5837498a1a84979ae714f932eff4eb8de0562b6bce8a310c6bf66da0c840' 
  AND token = 'zhY3MkuIQWwGzpzAhusrkdrpTfR5u/tqPDJm/tgEd4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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