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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8061dec214730dccd42e4c5bac8d2055aa17bc9702254c284e553c6f14a5b587' 
  AND token = '1KleK0K+b65CwZZmPTt9AyxuLnFQYPI5xVwdBaSkucI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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